What is the correct formula for determining the CIR.?

What is the correct formula for determining the CIR.?
A . CIR = Bc/Tc
B . CIR = Bc x Tc
C . CIR = Tc/Bc
D . CIR = Bc + Be
E . CIR = Tc/(Bc+Be)
F . CIR = (Bc+Be)/Tc

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Answer: A